Abstract
Styrene/4-hydroxystyrene block and gradient copolymers containing the organic dye Disperse Red 1 (S/HSDR) were synthesized using nitroxide-mediated controlled radical polymerization, and a random copolymer was made using conventional free radical polymerization. The three types of S/HSDR copolymer, with similar molecular weight and composition but different S/HSDR sequence distributions along each copolymer chain, were used as dispersed particles for a study of electrorheological (ER) suspensions. The characterization of each ER fluid as a function of controlled molecular structure in suspension showed different ER behaviors. In particular, the suspension of the S/HSDR gradient copolymer showed the greatest degree of enhancement in shear viscosity, by as much as a factor of 10, upon application of a 1700 kV/m electric field.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3287-3291 |
| Number of pages | 5 |
| Journal | Polymer |
| Volume | 47 |
| Issue number | 10 |
| DOIs | |
| State | Published - May 3 2006 |
Funding
We acknowledge the support of the Brain Korea 21 program, the NSF-MRSEC program (Grant DMR-0076097 and Grant DMR-0520513), and a 3M Fellowship (to J.K.).
Keywords
- Controlled radical polymerization
- Copolymers
- Electroheological flud
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry